/* ============================================================
   MB System Navigation
   Icons only (green default / purple hover-active)
   Text rendered via CSS fonts + absolute positioning
   jQuery accordion — one group open at a time
   ============================================================ */

@font-face {
  font-family: "Avenir MB";
  src: url("fonts/AvenirLTStd-Book.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "Avenir MB";
  src: url("fonts/AvenirLTStd-Roman.otf") format("opentype");
  font-weight: 500;
  font-style: normal;
}

@font-face {
  font-family: "Avenir MB";
  src: url("fonts/AvenirLTStd-Medium.otf") format("opentype");
  font-weight: 600;
  font-style: normal;
}

@font-face {
  font-family: "Akzidenz MB";
  src: url("fonts/AkzidenzGrotesk-Roman.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "Akzidenz MB";
  src: url("fonts/AkzidenzGrotesk-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
}

/* ---- layout shell ---- */
#mb-system-nav {
  --nav-w: 280px;
  --icon: 48px;
  --teal: #5fadad;
  --purple: #9a8fb8;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --open-bg: #f8fafc;

  width: var(--nav-w);
  font-family: "Avenir MB", "Akzidenz MB", system-ui, sans-serif;
  color: var(--ink);
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

#mb-system-nav * {
  box-sizing: border-box;
}

/* ---- group container ---- */
.mb-sys-group {
  position: relative;
  border-bottom: 1px solid var(--line);
}

/* ---- group header (icon + labels) ---- */
.mb-sys-group-header {
  position: relative;
  display: block;
  width: 100%;
  height: 64px;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
  outline: none;
}

.mb-sys-group-header:focus-visible {
  box-shadow: inset 0 0 0 2px var(--teal);
}

/* icon stack — green default, purple on hover/open */
.mb-sys-icon {
  position: absolute;
  top: 8px;
  left: 12px;
  width: var(--icon);
  height: var(--icon);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 48px 48px;
  transition: opacity 0.15s ease;
}

.mb-sys-icon-g {
  opacity: 1;
  z-index: 1;
}

.mb-sys-icon-p {
  opacity: 0;
  z-index: 2;
}

.mb-sys-group-header:hover .mb-sys-icon-g,
.mb-sys-group.is-open .mb-sys-icon-g,
.mb-sys-group-header:focus .mb-sys-icon-g {
  opacity: 0;
}

.mb-sys-group-header:hover .mb-sys-icon-p,
.mb-sys-group.is-open .mb-sys-icon-p,
.mb-sys-group-header:focus .mb-sys-icon-p {
  opacity: 1;
}

/* rendered text — absolute, next to icon */
.mb-sys-name {
  position: absolute;
  top: 14px;
  left: 72px;
  right: 28px;
  font-family: "Akzidenz MB", "Avenir MB", system-ui, sans-serif;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.15;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mb-sys-byline {
  position: absolute;
  top: 32px;
  left: 72px;
  right: 28px;
  font-family: "Avenir MB", system-ui, sans-serif;
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.01em;
  line-height: 1.2;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mb-sys-group.is-open .mb-sys-name {
  color: var(--purple);
}

.mb-sys-group.is-open .mb-sys-byline {
  color: var(--ink);
}

/* chevron */
.mb-sys-chevron {
  position: absolute;
  top: 26px;
  right: 12px;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease, border-color 0.15s ease;
}

.mb-sys-group.is-open .mb-sys-chevron {
  top: 28px;
  transform: rotate(-135deg);
  border-color: var(--purple);
}

/* ---- systems panel (accordion body) ---- */
.mb-sys-panel {
  display: none;
  position: relative;
  background: var(--open-bg);
  border-top: 1px solid var(--line);
  padding: 6px 0 10px 0;
}

.mb-sys-group.is-open .mb-sys-panel {
  display: block;
}

/* individual system row */
.mb-sys-item {
  position: relative;
  display: block;
  height: 36px;
  margin: 0;
  padding: 0;
  text-decoration: none;
  color: inherit;
}

.mb-sys-item:hover,
.mb-sys-item.is-active {
  background: rgba(154, 143, 184, 0.12);
}

.mb-sys-item-name {
  position: absolute;
  top: 6px;
  left: 72px;
  right: 12px;
  font-family: "Avenir MB", system-ui, sans-serif;
  font-weight: 500;
  font-size: 13px;
  line-height: 1.2;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mb-sys-item-uri {
  position: absolute;
  top: 20px;
  left: 72px;
  right: 12px;
  font-family: "Avenir MB", ui-monospace, monospace;
  font-weight: 400;
  font-size: 10px;
  line-height: 1.1;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mb-sys-item:hover .mb-sys-item-name,
.mb-sys-item.is-active .mb-sys-item-name {
  color: var(--purple);
}

/* rail mark under open icon column */
.mb-sys-item::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 34px;
  width: 2px;
  background: var(--line);
}

.mb-sys-item:first-child::before {
  top: 0;
}

.mb-sys-item:last-child::before {
  bottom: 0;
}

.mb-sys-item::after {
  content: "";
  position: absolute;
  top: 15px;
  left: 31px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line);
  border: 2px solid var(--open-bg);
}

.mb-sys-item:hover::after,
.mb-sys-item.is-active::after {
  background: var(--purple);
}

/* ---- per-group icon sprites (green / purple) ---- */
.mb-sys-group[data-group="core"] .mb-sys-icon-g {
  background-image: url("system_nav/core.group_icon.g.png");
}
.mb-sys-group[data-group="core"] .mb-sys-icon-p {
  background-image: url("system_nav/core.group_icon.p.png");
}

.mb-sys-group[data-group="elemental"] .mb-sys-icon-g {
  background-image: url("system_nav/elemental.group_icon.g.png");
}
.mb-sys-group[data-group="elemental"] .mb-sys-icon-p {
  background-image: url("system_nav/elemental.group_icon.p.png");
}

.mb-sys-group[data-group="dynamic"] .mb-sys-icon-g {
  background-image: url("system_nav/dynamic.group_icon.g.png");
}
.mb-sys-group[data-group="dynamic"] .mb-sys-icon-p {
  background-image: url("system_nav/dynamic.group_icon.p.png");
}

.mb-sys-group[data-group="extension"] .mb-sys-icon-g {
  background-image: url("system_nav/extension.group_icon.g.png");
}
.mb-sys-group[data-group="extension"] .mb-sys-icon-p {
  background-image: url("system_nav/extension.group_icon.p.png");
}

.mb-sys-group[data-group="ambition"] .mb-sys-icon-g {
  background-image: url("system_nav/ambition.group_icon.g.png");
}
.mb-sys-group[data-group="ambition"] .mb-sys-icon-p {
  background-image: url("system_nav/ambition.group_icon.p.png");
}

.mb-sys-group[data-group="reliance"] .mb-sys-icon-g {
  background-image: url("system_nav/reliance.group_icon.g.png");
}
.mb-sys-group[data-group="reliance"] .mb-sys-icon-p {
  background-image: url("system_nav/reliance.group_icon.p.png");
}

.mb-sys-group[data-group="distributed"] .mb-sys-icon-g {
  background-image: url("system_nav/distributed.group_icon.g.png");
}
.mb-sys-group[data-group="distributed"] .mb-sys-icon-p {
  background-image: url("system_nav/distributed.group_icon.p.png");
}

/* ---- compact / horizontal rail variant (optional) ---- */
#mb-system-nav.is-rail {
  --nav-w: 72px;
}

#mb-system-nav.is-rail .mb-sys-name,
#mb-system-nav.is-rail .mb-sys-byline,
#mb-system-nav.is-rail .mb-sys-chevron,
#mb-system-nav.is-rail .mb-sys-panel {
  display: none !important;
}

#mb-system-nav.is-rail .mb-sys-group-header {
  height: 64px;
}

#mb-system-nav.is-rail .mb-sys-icon {
  left: 12px;
}